This is how my doctor explained for me to do it and it works:
Pack 1 - take week 1, 2, 3.
Start Pack 2 immediately. Take entire pack.
Rinse, wash, repeat.
There is uncertainity as to if it's ok to do for long periods of time, so it's advised that you don't.
The lower estrogen pills work best for this method. I have not tried it using the patch or high lvl pills.